US2539636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve
Assignee: RCA Corp
•
Filing: 1945-08-31
•
Granted: 1951-01-30
•
Expires: 1965-08-31
Abstract
No abstract record available.
Inventors
- 👤 Frank E Runge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:40
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/04; F16K5/0457; F16K5/0478; C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4358; Y10T137/4449
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE49086C
Cited
US1739787A
Cited
US2145628A
Cited
US2210046A
Cited
US2285222A
Cited
US2424567A
Cited
US2394364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |